Eight-year-old cousins Patrick and Beth find themselves 1450's England during the War of the Roses, where they discover the missing treasures and meet the person who has been sending notes through the Imagination Station.
While searching for Eugene, who is missing somewhere in time, time-travelling cousins Patick and Beth arrive on an orphan train heading west in 1874 and befriend an orphan falsely accused of being part of a train robbery.
"World War Two has come to Holland--and so have Patrick and Beth. When the cousins hide at a farm with Dutch Resistance workers, they are given a secret mission: smuggling a Jewish baby to her mother"--